<template>
<div>
     <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
        <!-- 警示框区域 -->
        <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false">
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover"
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
            </el-col>
        </el-row>

        <!-- Tab 标签页区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 动态参数区域 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable  @close="handleClose(i, scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>

            <!-- 静态属性区域 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 添加属性表格 -->
                <el-table :data="onlyTabData" border stripe>
                    <!-- 展开行 -->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <!-- 循环渲染tag标签 -->
                            <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                                {{item}}
                            </el-tag>
                            <!-- 输入的文本框 -->
                            <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <!-- 添加按钮 -->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="静态属性" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>            
        </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogColse">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogColse">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
</div>
    
</template>

<script>
export default {
    data(){
        return {
            // 商品分类列表
            catelist:[],
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //级联选择框双向绑定到的数据
            selectedCateKeys:[],
            // 被激活的页签名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTabData: [],
            // 控制对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数表单数据对象
            addForm : {
                attr_name: ''
            },
            //添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    {required: true, message: '请求参数名称', trigger: 'blur'}
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible : false,
            // 修改表单的数据对象
            editForm:{},
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                    {required: true, message: '请求参数名称', trigger: 'blur'}
                ]
            },

        }
    },
    created() {
       this.getCateList()
    },
    methods:{
        // 获取所有商品分类列表
       async getCateList(){
          const {data : res} = await this.$http.get('categories')
          if(res.meta.status !== 200 ){
              return this.$message.error('获取商品分类失败！');
              
          }
          this.catelist = res.data
        //   console.log(this.catelist);         

       },
        //级联选择框选中项变化，会触发这个函数
       handleChange(){
             this.getParamsData()

       },
       // Tab 栏点击事件处理函数
       handleTabClick(){
        //    console.log(this.activeName);
            this.getParamsData()
       },
       // 获取参数的列表数据
       async getParamsData() {
           //    console.log(this.selectedCateKeys);
            //  如果选中的分类id的长度不等于 3 就让selectedCateKeys 置空
            if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTabData = []
                return 
            }
            //选中的式三级分类
            console.log(this.selectedCateKeys);  
            //根据所选分类id 和当前所处的面板，获取对应的参数
            const {data : res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                params: { sel : this.activeName }
            })
            if(res.meta.status !== 200) {
                return this.$message.error ('获取参数列表失败!')
            }
            
            // 循环遍历item.attr_val
            res.data.forEach(item => {
                // 如果item.attr_val 不等于空踩进行分割 否则返回空的字符串
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible = false
                //文本框中输入的值
                item.inputValue = ''
            });
            // console.log(res.data);
            
            
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }  else {
                this.onlyTabData = res.data
            }
       },
       //监听添加对话框的关闭事件
       addDialogColse() {
           this.$refs.addFormRef.resetFields()
       },
       //点击按钮 添加参数
       addParams(){
           this.$refs.addFormRef.validate( async validata => {
               if(!validata) return
               const {data : res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                   attr_name: this.addForm.attr_name,
                   attr_sel: this.activeName
               })

               if(res.meta.status !== 201) {
                   return this.$message.error('添加参数失败!')
               }
               this.$message.success('添加参数成功!')
               this.addDialogVisible = false
               this.getParamsData()
           })
       },
       // 点击按钮 展示修改的对话框
       async showEditDialog(attr_id) {
            const {data : res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params : {attr_sel : this.activeName}
            })
            if(res.meta.status !== 200) {
                return this.$message.error('获取失败!')
            }
            
            this.editForm = res.data
            this.editDialogVisible = true
       },
       // 重置修改的表单
       editDialogColse() {
           this.$refs.editFormRef.resetFields()
       },
      // 点击确定 修改参数信息
       editParams() {           
           this.$refs.editFormRef.validate(async valid => {
               if(!valid) return 
               const {data : res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
               {attr_name: this.editForm.attr_name, attr_sel: this.activeName}
              )
           
                if(res.meta.status !== 200){
                    return this.$message.error('修改信息失败!')
                }
                
                this.$message.success('修改信息成功!')
                this.getParamsData()
                this.editDialogVisible = false
           
          })           
       },
       // 点击删除 删除信息
       async removeParams(attr_id){
           const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)
            
            // 用户取消了删除操作
            if(confirmResult !== 'confirm') {
                return this.$message.info('已取消删除!')               
            }

            // 确认删除业务逻辑
             const {data : res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

             if(res.meta.status !==200) {
                 return this.$message.error('删除失败!')
             }
             this.$message.success('删除成功!')
             this.getParamsData()
        
       },
       // 文本框失去焦点,或摁下了 Enter 都会触发
       handleInputConfirm(row) {
           
            if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有 return 说明输入有内容 需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求保存此次操作
            this.saveAttrVals(row)
       },
       // 将对 attr_vals的操作保存到数据库
       async saveAttrVals(row) {
           // 需要发起请求保存此次操作
            const {data : res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败!')
            }
           
           this.$message.success('修改参数项成功!')
       },
       // 点击按钮,展示文本输入框
       showInput(row) {
           row.inputVisible =true
            // 让文本框自动获得焦点
           this.$nextTick(_ => {
           this.$refs.saveTagInput.$refs.input.focus();
           });
       },
       //删除对应参数可选项
       handleClose(i, row){
           row.attr_vals.splice(i,1)
           this.saveAttrVals(row)

       }       

    },
    computed:{  // computed计算属性
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        //当前选中的三级分类的id
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算添加 对话框的标题
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }    
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin-top: 15px;
}
.el-alert{
    vertical-align: middle;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>